Leon f



(No Model.)

L. F. DOUGLASS. METHOD 01" AND MEANS FOR DUPLIGATINGOR TRANSPBRRING PHONOGRAPHIG RECORDS.

Illllllh Patented May 24 :E W 1 11;. g i A W Mi VLi W E W F NrTED STATES PATENT OFFICE.

LEON F. DOUGLASS, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO EDWARD D. EASTON, OF SAME PLACE.

METHOD OF AND MEANS FOR DUPLICATING OR TRANSFERRING PHONOGRAPHIC RECORDS.

SPECIFICATION forming part of Letters Patent No. 475,490, dated May 24;, 1892.

Application filed March 17,1892. Serial No. 425,259- (No model.)

T0 at whom, it may concern.-

Be it known that- I, LEON F. DOUGLASS, a citizen of the United States, residing at VVashington, District of Columbia, have invented certain new and useful Improvements in Methods of and Means for Duplicating or TransferringPhonographic Records; and I hereby declare the following to be a full, clear, and exact description of the same, such as will enable others skilled int he art to which it appertains to make and use the same.

My invention relates to a new and useful method of duplicating or transferring phonographic records; and it consists, generally stated, in delivering the sound-Waves emitted by the reproducing-diaphragm toareceivingdiaphragm carrying the cutting-stylus, which causes said diaphragm to move successively or in the order of the force of the sound-waves and out like forms of sound-waves upon the receiving phonogram-blank, thus making a duplicate of the record.

A second feature of the invention resides in providing means for confining and directing the sound-waves from one diaphragm to the other.

A third feature resides in delivering the sound-waves through a channel or conduit of rarefied air or air at a reduced pressure, and, finally, in the construction and arrangement of the several parts, whereby these features are obtained, all as will hereinafter be described, and afterward pointed out in the claims.

In the accompanying drawings, forming a partof this specification, like symbols of reference refer to like parts wherever they occur, in which Figure 1 is a plan view showing the d aphragms in position on the respective cyllnders and the flexible conduit for conducting the sound-waves from one diaphragm to the other. Fig. 2 is a cross-section through one of the diaphragms, showing the air-tight connection of the conduit therewith.

In the drawings, 1 indicates the phonogramrecord, mounted upon a mandrel of any ordinary or approved constructlon, which is turned by the screw-shaft 2 in the usual manner.

3 is the guide-rod, mounted in supports 4,

vided with an arm or extension 7, the function of which being to throw the reproducingstylus 9 into or out of engagement with the phonogram-record cylinder. This arm or extension I also prefer to mount upon the re- 79 ceiving-diaphragm, in order that either or both diaphragms may be put into or out of engagement with their respective phonograms. I connect the reproducing and receiving diaphragms by a conduit or flexible pipe connection 10, said pipe extending thrdugh'a thimble l1 and into a nose or extension 12 on the respective diaphragms.

13 indicates a conical-shaped flexible thimble or ferrule fitting tightly around the ends of the connecting-conduit l0 and into the noses 12 of the diaphragms, thus making an air-tight connection between the same and confining the sound-waves therein. I preferably rarefy or reduce the atmosphere in the conduit 10, in order to more readily transmit the sound-waves and make the diaphragms more susceptible to vibration on account of pressure of the outside air.

To reduce the air in the conduit, it is only necessary to compress the same before insertion, which will exclude a portion of the air therefrom, and the conduit will of its own assertion of elasticity resume its normal position.

I have illustrated in Fig. 1 the ordinary 5 means of operation of the several phonograms; but I do not wish to be understood as confining myself to such construction, as it is obvious that any suitable mechanism may be substituted and employed to accomplish the same results without in the least departing from the nature and principle of my invention.

Having thus described my invention, what I, claim, and desire to secure byLetters Patent of the United States, is-

1. The method herein described of dupli- 5 eating or transferring phonographic records, which consists in deliveringthe sound-waves? emitted by the reproduoingdiaphragm in contact with the record-phonogram to a receiving-diaphragm, which actuates the cut- 10 ting-stylus in contact with the receiving-p110 nogram blank, thereby making a copy of said sound-waves upon the receiving phonogramblank, substantially as and for the purposes described.

I 5 2. The combination,with the recordphono- ,gram, of a receiving-blank phonogram, a diaphragm forreceiving vibrations from the record-phonogram, and a diaphragm for trans- {mitting vibrationsor sound-wave forms on 20 tliereceiving-blank phonogram, snbstan tially as and for the purposes described.

The combination, with the record-phon 0- :gram, of a diaphragm adapted to be vibrated thereby, a diaphragm adapted to be vibrated by the sound-waves emitted by the first diaphragm, and a receiving-blank phonogram for receiving the vibrations from the latter diaphragm, substantially as and for thepurposes substantially as and for the purposes described.

In testimony whereof I affix my signature,in presence of two witnesses, this 16th day of March, 1892.

LEON F. DOUGLASS.

Witnesses:

WM. A. EASTERDAY, F. R. CORNWALL. 

